To selectively form an extension conveyor and a passage forward in the carrying direction of a fixed conveyor, by permanently installing the fixed conveyor in a fixed position on a floor surface, in a carrier conveyor.

The carrier conveyor 10 has the fixed conveyor 20 fixed to the fixed position on the floor surface and a slide conveyor 30 extractable to a front work position in the carrying direction of the fixed conveyor 20 from a lower storage position of the fixed conveyor 20. The slide conveyor 30 can be vertically lifted in the work position, and is connected in series by setting its carrying surface at the same level to a carrying surface of the fixed conveyor 20 in a lifting mode, and can be stored in a lower part of the fixed conveyor 20 in a lowering mode.

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